http://www.steamgifts.com/about/guidelines

General

• Use the appropriate avenues for support. If you have an issue with another user, submit a ticket with a user report, rather than calling them out within the community or on the forum.

http://www.steamgifts.com/about/faq

If I win a gift, when can I expect to receive it?

• Giveaway creators are allowed one week to send the gift after the giveaway has ended. Depending on the type of gift and the giveaway creator, you might receive the gift to the e-mail address you have listed on the account page, a key might be added beside the gift you won, or the giveaway creator might have sent you a friend request on Steam to make the exchange. Please remain patient, and do not contact the giveaway creator during this time. If the gift is not received after one week, you can mark the gift as not received, and attempt to contact the giveaway creator on Steam to follow-up.

I think I spotted a fake giveaway, what should I do?

• We typically allow all giveaways to run their course without judgement, and allow the giveaway creator a fair chance to prove themselves and to come through with the gift in the end. An exception is when the giveaway creator enters a description that clearly states the giveaway is fake, or if the description illustrates a lack of understanding of how the giveaway system works. Please refrain from posting any comments accusing the giveaway creator of posting a fake giveaway, and only create a support ticket if the giveaway is fake beyond a reasonable doubt.

You should remove the link, it's considered calling out. edit:beaten by a zombie

1st of all - no calling out. Delete link to the GiveAway or you may gety suspended yourself (read FAQ and guidelines next time)

2nd of all - nothing you can do. It's not like SG staff gonna buy each not delivered game for a winner (otherwise you could just create alt account, make private GA, give link to yourself and then demand the game ;p). Mark as not received and move on. Guy wil loose 2 GA slots because of these 2 fake copies, also for low feedback will end up on bunch of blacklist, not get into groups etc.

Okay, thanks for all answers. I'm closing.